Valve structure for explosive-engines.



E. 4S. CAMERON.

VALVE STRUCTURE FOR EXPLOSIVB ENGINES.

APPLICATION FILED 1`\I.\R.4.1912v Patented Mar. 17, 1914.

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VALVE STRUCTURE PoR BXPLOSWE ENGINES.

APPLICATION FILED MAR. 4, 1912y Patented Mar. 17, 1914.

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MvT/55555.' ,WL/ENTER.. W( Evere SQ( memm. v v l EVERETT S. CAMERON, OF BEVERLY, MASSACHUSETTS.

VALVE STRUCTURE FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent.

Patented Mar. i7, 19ML.

Application led March 4, 1912. Serial No. 681,362.

To all 'whom it may concern Be it known that I, EvERn'rr S. CAMERON,

a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful` Improvements in Valve Structures for Explosive-Engines, of which'the following is a specification.

The objects of my invention are to., provide a dome shaped piston valve having a series of ports through its annular wall, to uncover a series of intakes and a series of exhausts and to register with a series of inlets, respectively formed around the engine-cylinder, and means to impart a reciprocating motion to the valve to permit a very free gas supply witha short travel of said valve. 1 f

A further object of my invention is to provide means to permit the inrushing supply to sweep over the `valve-head and keep the chamber between the dome of said valve and said cylinder always filled with fresh gas and thereby to obtain a more perfect combustionat the time of ignition.

With these objects in view the invention consists in the novel construction and combination of parts hereinafter described and claimed, and illustrated in the accompanying drawings, consisting of two sheets, show?` ing thepreferred form of my invention` which- Figure 1 is a central vertical section of an explosive engine cylinder, showing the parts embodying my improved valve structure, as at ring position. Fig. 2 a section taken on line .-.'of Fig. 1. Fig. 3 is a plan section on line 'fz/. y. of Fig. 1. Fig. 4 is a side view of the cam for actuating my improved piston valve, and showing, in diagrammatic form, the movements in degrees throughout a revolution of said cam,

A- represents the engine-cylinder; B- the crank-case, and C- the engine-shaft.

A gas chamber surrounds the cylinder A, at its upper part, as at -a-, and this chamber is incl'osed by' a tubular ported bushing -.Z1 which 1s made fast in the bore of said cylinder and extends from the top thereof.

-c represents my improved piston valve, which is slidable in the bushing-band has a transverse head c1- formed n earits upper part so as to provide a chamber in said valve, as -c2-, inopen communication with the engine-cylinder, and4 the top of said head -elhas bifurcated portions to receive a pin -dto act as a pivot center for a roller -e-.

The top of the cylinder A is closed by an inverted U-shaped cap -f-g having a jour-Y nal bearing at each end, as at -f1, 1 to receive a horizontal rotary shaft g whose axial center is in alinement with the center of the valve-roller -eand axis of ytween the valve -cand cylinder-cap --f-, to keep the valve roller -ein firm contact uponv the working face of the cam A gas supply chamber -fL- is located above the valve The bushing-bis provided with a series ofA intakes b1- arranged in a horizontal plane at its upper part, and also provided with a series of ex -hausts -bsarranged in a horizontal plane at its lower part. The exhausts -b8 communicate with exhaust chambers ---a2' formed inthe engine-cylinder.

When the valve -c uncovers the intakes -Z\1-\ the supply passes from the chamberv fs-3 through said intakesl and into the gas chamber -a-.

The valve -eis provided with a series of ports o8- arranged in a horizontal plane through its annular wall,.to 'register with a series of inlets -b2- formed atthe lower part of the gas chamber -a-.

On the canishaft -gis made fast a sprocket wheel 1I- which has a chain connect'ion with a pinion -4112- fast on the en- VBti gine-shaft C, in the manner as indicated by dotted lines in Fig. 1.

The engine-cylinder is formed with a water jacket, as -y'-, extending from its top to about two thirds its length, to aid in connection .with the gas supply in keeping the explosive portion of the engine cool.v

The gas supply enters an o ening f2- formed in the cap -fand lls the chamberfsabove the valve -c-.

In operation: At beginning of the suction stroke (Fig. 8,) the highest part of the cam 1+ comes into contact with and forces the roller -edownward a movement sufiicienty to allow the valve to uncover the intakes -bland elo-se the exhaust ports 44193-, and also permit the valve-ports -c3- to register with the inlets -Z 2, when the crank-pin frwill then be at the point -1- in said figure. The supply now passes from the chamber f3- through the intakes -b1, of the bushing through the chamber ct-e, through the inlets b2- of said bushing, through the valve ports -03- and into the chamber -c-, between valve -0 and engine-piston #7)-, this amount of travel of said valve being governed bythe degree of movement had by the highest part of the cam, 25 as shown in Fig. f1, while the crank-pin will have moved 165, to the point 2 in Fig. 5, in making this suc` tion stroke. Justl before the crankpin reaches the end of suction stroke, at point 2 in Fig.- 6, the cam -gldisposes its next lower working face to the roller' teto permitu ward travel of the valve in closing the inta es b1- and inlets -b2, vthis amount of travel of said valve being governed by the degree of movement had by this portion of said cam, 140 as shown in Fig. 4,

while the crank-pin will have moved 160, to the point 3 in Fig. 6, in making this com- 4ression stroke. The firing now takes place, Ey' means of the spark plug -s-, and as the explosion stroke terminates at the point 4 in Fig. 7, thecam will have disposed its lowest rise, governed by the degree of movement, 195 as shownin Fig. 4, to permit a further u ward movement of the valve to uncover t e exhaust ports b3- when the crank-pin will then have traveled 230, to the point 5 in Fig. 7, to force out the exhaust, after which the cam actuates the valve tothe point of. suction stroke, as shown in Fig. 8, and thereby completing the cycle of the engine.

The cam g1- revolves ata lesser speed than the engine-crank rand in the same direction, as indicated by the arrows on said parts in Fig. 1.

The employment of a bushing, as facilitates cheapness and accurateness in machining to provide the different series of intakes --51-,' inlets b2, and exhausts b3- but l do not Wish to limit myself to the use of such bushing as the said intakes,

inlets, and exhausts may be formed in the cylinder casting, to lead direct from the cylinder-bore to the supply chamber l-a'- and to the exhaustchamber a',-.

What I claim and desire to secure by-Letters Patent, is

1. In combination with the cylinder, of a closure member for the end of said cylinder `having a gas supplychamber; an auxiliary gas chamber surrounding the cylinder-bore, near the outer part thereof, and also an exhaust chamber leading from the bore; a tubular bushing fixed in the cylinder-bore, said bushing having a series of intakes communicating with the outer part of the auxiliary chamber, a series of inlets leading from the inner part of the latter, and a series of exhaust ports communicating with the exhaust chamber; a dome-shaped piston valve slidable in the bushing, said valve having a series of ports to register with the inlets of the latter; a cam adapted to impart an inward movement to said valve to admit the supply through the intakes, through the auxiliary chamber, through the inlets, and through the ports of said valve, during the period of suction stroke, and means to return said valve to uncover the exhaust ports, substantially as set forth.

2. In combination with the cylinder,`of a closure member for the end of said cylinder having a gas supply chamber; an auxiliary gas chamber surrounding the cylinder-bore, near the--outer part thereof said chamber having a series of intakes and a series of inlets leading from the bore; an exhaust chamber surrounding the cylinder-bore, said -chamber having a series of outlets leading from the bore; a dome-shaped piston valve slidable in the cylinder-bore, said valve having a series of ports to register with the Vseries of inlets from the auxiliary chamber; a rotary cam to impart an inward movement to said valve to uncover and admit the supply through the intakes, through the auxiliary chamber, through the inlets, andY through the ports of said valve, during the period of suction stroke, and means to -return said valve to uncover the outlets leading to the exhaust chamber, substantially as set forth.

3. 1n combination with the cylinder, of a closure member for the end of said cylinder having a gas supply chamber; an auxiliary gas chamberformed in' the c linder-bore, near the outer part'thereof, an also an exhaust chamber leading from the bore; a

tubular bushing tixe'd in the cylinder-bore,

said bushing having three transverselyarranged series of ports, oneseries to form intakes communicating with the outer art of the auxiliary chamber, an interme iate series to form inlets leading from the inner part of the last said chamber, and a series of izo exhausts to form outlets communicating with the exhaust chamber; a dome-shape piston valvev slidable in the bushing, said valve having al series of ports to register with the series of inlets from the auxiliary chamber; a roller carried upon the dome of said valve;l a' rotary shaft having an in:v

' tegral' :cam for said roller to move upon,

said cam designed to impart4 an inward movement to saidl valve to uncover and. ad-

mit the supply throughl the intakes, through the auxiliary chamber, through the, inlets,

and through the ports'ofsaid valve, during the period of suction stroke, and means to return said valve to uncover the outlets during the period of exhaust stroke, substanbore; a tubularbu'shing fixed in the cylinder-4 bore and having three series of vports ar ranged transverse of and in a horizontal plane through its wall', one series to ,form intakes communicating with the outer part of the auxiliary chamber, an intermediate series to form inlets leading from the innerpart of the auxiliary chamber, and an linner series to form outlets communicating with the exhaust chamber; a dome-shaped piston valve slidable in'said bushing and provided with an explosive chamber, said valve having a series of ports to register-with the series of inlets'fromthe auxiliary chamber; a roller carried 'by said valve; a shaft; a

`cam carried by said shaft and having'an irregular iiat working face for said roller to move upon, said cam `designed to impart an inward movement to `said valve.` to uncover and admit the supply throughV the intakes, vthrough the auxiliary chamber, through the inlets and into vthe explosive chamber, during the period of suction stroke; means to respectively keep the said rollerin contact with the cam face and to return said valve to uncover the outlets to thel exhaust chamber, and means to rotate saidV shaft in one direction, substantially as setl forth.

5. In combination with the cylinder having the auxiliary gas chamber ma and exhaust chamber -a2-; the closure member -f having a main gas supplychamber;

' the fixed bushing -bhaving the intakes ,-b1 intermediate` inlets mbz, and outlets --ZJ3-; the valve ---0- having ports 0L to register with the inlet; the roller -d-icarried by said'valve; the shaft 'ghaving integral cam `-g1- and the said cam` designed to impart an inward movement to said valve to uncover the intakes and the inlets, during the period of suction stroke; the pull-springs -L- to keep the roller in contact With the cam face and to return the valve to uncover the outlets to the exhaust chamber, and driving arrangement consisting of the sprocket wheel Pal, pinion c2- and chain connection -z'1-, substantially as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

EVERETT S. CAMERON.

Witnesses M. P. CAMERON, L. L. PRATr. 

